Actually I think If you were left alone with no one else you would go insane. I heard there was a test that happened before there were limitations on human testing and some doctor put people in small rooms with ear muffs, gloves and a blindfold on to block out sensory input. The test was meant to last 45 days or something and patients barely made it 4 days. Some thought a miniature rocket ship was firing pellets at their arms and others thought the room filled with dogs. So a good example of this is Tom Hanks on Castaway and how he went insane and made Wilson.